transformer-call.rst
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Input transformers are now called only once in the execution path of InteractiveShell, allowing to register transformer that potentially have side effects (note that this is not recommended). should_run_async, and run_cell_async now take a recommended optional transformed_cell, and preprocessing_exc_tuple parameters that will become mandatory at some point in the future; that is to say cells need to be explicitly transformed to be valid Python syntax ahead of trying to run them. :ghpull:`12440`